Stanza 1 means that this person use to live in fear wondering if things go wrong trying to control everything that happened. So because of that she limted the things she could do.
Stanza 2 means that she relizes and sees thats theres so much more out there in the world and that she cant live in fear. It also means that she had this burnig desire to seek out and to explorie the world.
Stanza 3 means that shes finally done with living inside the walls, living in fear, and living in limits. Shes ready to break through, shes ready to seek beyond the limits, beyond the fear. And she has and she thrives in it.